Method and system for performing cryptocurrency asset transaction

A system for performing cryptocurrency asset transactions, comprising a plurality of data processing devices, the system being configured to perform during operation:

• generating, by a server, at least one first target cryptocurrency key pair and at least one corresponding first target cryptocurrency address of a first cryptocurrency, and storing the at least one first target cryptocurrency key pair and the at least one first target cryptocurrency address on the server;
• transferring at least one first cryptocurrency asset from at least one initial cryptocurrency address to the at least one first target cryptocurrency address employing a first cryptocurrency protocol;
• in reaction to determining that a cryptocurrency asset has been transferred:
• providing a first password in a first user device, and
• providing, by the server, first user data assigned to a first user with a first vault asset corresponding to the at least one first cryptocurrency asset;
• transmitting the first password from the first user device to the server via a first communication channel employing a first quantum key distribution protocol and verifying the first password by the server;
• and
• in reaction to the first password having been verified:
• removing, by the server, a second vault asset from the first user data;
• and
• transmitting at least one second target cryptocurrency key pair and at least one corresponding second target cryptocurrency address of at least one second cryptocurrency asset corresponding to the second vault asset from the server to the first user device via the first communication channel employing the first quantum key distribution protocol or providing, by the server, second user data assigned to a second user with the second vault asset.